Evaluation of liquid metal embrittlement-free weld by micro-plasma arc welding of Zn-coated interstitial free steel

Q4 Materials Science

Welding International Pub Date : 2023-05-04 DOI:10.1080/09507116.2023.2218562

Christopher Jose Chittilappilly, S. Bag, A. Karani

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Abstract

Abstract The liquid metal embrittlement (LME) severity is a significant concern in the fusion welding of Zn-coated steel. The LME severity in galvannealed (GA) interstitial free (IF) steel processed through microplasma arc welding (MPAW) is investigated. The weld geometry, microstructure and mechanical properties of the 0.8 mm thin butt-welded structure are evaluated to check the welding quality. Optical microscopy and field emission scanning electron microscopy (FESEM) of the weld surface are considered to observe any LME cracks. The high-temperature tensile test is executed on GA-IF steel to simulate external stress-free MPAW conditions. The ultimate tensile strength of the welded joint is more than that of the base material, and it is LME-free, which signifies that the current MPAW system can be successfully used for joining GA-IF steel. The microstructure of the weld zone is having large grain structure and much more hardness than the base material. Even the high-temperature tension test does not show any LME cracks. Approximately, one-third of yield strength is reduced as the temperature rises from 600 °C to 700 °C. Overall, the parametric domain for MPAW of GA IF steel is successfully evaluated, which can produce any LME-free weld.

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无锌间隙钢液态金属脆化焊缝的微等离子弧焊评定

摘要液态金属脆化（LME）的严重程度是镀锌钢熔焊中的一个重要问题。研究了微等离子弧焊（MPAW）处理的镀锌（GA）无间隙（IF）钢中LME的严重程度。0.8的焊缝几何形状、微观结构和机械性能 mm薄对焊结构进行评定，以检查焊接质量。焊接表面的光学显微镜和场发射扫描电子显微镜（FESEM）被认为可以观察任何LME裂纹。对GA-IF钢进行高温拉伸试验，模拟无外部应力MPAW条件。焊接接头的极限抗拉强度高于母材，并且不含LME，这表明目前的MPAW系统可以成功地用于连接GA-IF钢。焊接区的微观结构具有大的晶粒结构和比基体材料高得多的硬度。即使是高温拉伸试验也没有显示出任何LME裂纹。当温度从600升高时，大约三分之一的屈服强度降低 °C至700 °C。总之，成功地评估了GA IF钢MPAW的参数域，该参数域可以产生任何LME自由焊缝。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.